The European Court of Human Rights has ruled that five terrorism suspects, including militant cleric Abu Hamza, can be extradited from Britain to the United States.

The court has ruled there will be no violation of human rights if the terrorism suspects are held in solitary confinement at ADX Florence - what is called a 'supermax' jail, in Colorado.

Hamza is accused of taking hostages in Yemen and of an alleged plot to set up a terrorism training camp in the United States.

Because of his disabilities, he may be held in another jail other than ADX Florence.

Hamza, who has one eye and a hook for one hand, was jailed in Britain for seven years in 2007 for inciting followers to murder non-believers.

The defendants had complained that conditions at Florence and possible multiple life sentences they face would be grossly disproportionate and amount to inhuman or degrading treatment.

British prime minister David Cameron says the ruling is one of the Strasbourg court's most important since the September 11 terror attacks, and makes it easier for the UK to send suspects to its closest ally.

The suspects can appeal against the ruling in the court's grand chamber, but few cases make it that far.

The European Court of Human Rights had previously halted the extradition of Egyptian-born Hamza and three of the other men to the United States on terror charges, saying the case needed further examination.

The court later found that, given US assurances, that there was no real risk the men would either be designated as enemy combatants and be subject to the death penalty or subjected to extraordinary rendition.